The 1940 Oklahoma Sooners football team represented the University of Oklahoma in the 1940 college football season. In their fourth year under head coach Tom Stidham, the Sooners compiled a 6–3 record (4–1 against conference opponents), finished in second place in the Big Six Conference, and outscored their opponents by a combined total of 121 to 105. No Sooners received All-America honors in 1940, but four Sooners received all-conference honors: tackle Roger Eason, end Bill Jennings, guard Harold Lahar, and back John Martin.